Fire Rating For Roof Foam Insualation Boards

Shown to withstand delamination deterioration warping and jobsite damage more effectively than other roofing membrane substrates such as paper faced gypsum board fiber board and perlite insulation.

Fire rating for roof foam insualation boards.

Polyiso remains the only foam plastic insulation product for direct application to steel roof decks to earn fm approval for class 1 roof systems. Some types of thicker foam board insulation are available but they may need to be special ordered. The glass fiber reinforcement provides improved fire performance and dimensional stability. I ve written several posts about how to insulation basement walls in which i promote the use of foam board insulation as the first line of defense against moisture and mold.

Rigid roof insulation board. Thermax sheathing specially designed to hold a class a fire rating. It comes in standard size 4 8 sheets and smaller sizes in many different thicknesses from 1 4 inch to 2 inches. It s light weight provides ease of handling.

Thermax sheathing can be installed exposed to the. An excellent fire barrier densdeck roof boards feature a noncombustible core and inorganic surface that offer greater fire protection than. Expanding spray foam insulation has grown fast as one of the most popular options over time because of its cost. An fm class 1 designation means the roof assembly has been subjected to a series of tests in addition to external and internal fire exposure including wind uplift water leakage and impact resistance.

Foam board insulation types. Because of this i often get questions about which type of foam board insulation to use and what r values these products provide. Celetox 100mm has rated class 1 in surface spread of fire and rated e in reaction to fire. Since most fire codes call for a minimum of half hour fire rating over foam insulations paneling would probably not provide a sufficient fire barrier over the foam insulating board.

Foam board insulation is easy to use and is a great diy way to add some insulation. Fire rated expanding foam can provide up to 240 minutes of fire rating and is used as an efficient seal against gas and smoke. There are three basic foam insulation board products on the. Thermax sheathing is a nonstructural rigid board insulation with a glass fiber infused polyisocyanurate foam core laminated between 1 0 mil smooth reflective aluminum faces.

Exposed foam board insulation fire hazards. Examples include 1 polyisocyanurate roof insulation and spray polyurethane foam roofing systems directly applied to steel roof decks 2 some metal faced polyurethane and polyisocyanurate laminated panel products and 3 some polyurethane foam sealant applications.